Befractory cement composition



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:5. M Patented Mar. 16, 1926.

VI Ubh HUIUI UIIUU UNITED STATES PATENT OFFICE.

WILLIAM E. BOCHO'W, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR '10 EABBISON- WALKEB BEFBAGIOBIES COMPANY, 01" PITTSBURGH, PENNSYLVANIA, A COB- POBATION OI PENNSYLVANIA.

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Io Drawingf Toallwhomitmayconcem: Be it known that I, WILLIAM F. Roonow, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny silicate in d and State of Pennsylvania, have invented a new and useful Improvement in a Refractory Cement Composition, of which the following is a specification.

This invention relates to refractory cements. More particularly it relates to certain mixtures of dry materials, ca able of forming a cement or mortag, upon e addition of water. The nibrtar is suitable for use in building walls of refractory bricks, and also for spreading over such walls in the form of a coating or plaster. A' articular object of the invention is to rovi e a com.- position which may be forme by mixin together dry powdered materials, and w ich can be shipped in the dry state to the point of use, there to be made up into a. mortar or a cement of the desired consistency simply by the addition of water.

Another object of the invention is .to provide such a mixture in a form that may be shipped in the smallest possible space, and with all unnecessary weight eliminated. 2

Other uses and advantages of the material will be understood by those familiar with the art.

.Heretofore fire cla have been mixed with to form a mortar or cement. The cla other materials have been pulverize and the sodium silicate has been added in liquid form, the resulting mixture being formed into a mortar or aste of desired consistency which has then en shipped in thissemiliquid form to the pointof use in cans or barrels. This ractice is objectionable because of the d' culty in handling semi-liquid material, the extra cost of transporting the water in the mixture, and for othefrea- In certain cases the insoluble materials have been shipped in dry form, and the sodium silicate 1n cans, in liquid form, the two to be mixed at the point of use to form a mortar.'. This is likewise ob'ectionable because of the difliculty in handling and shipping a liquid, and the dan er of not obtaining a umform mixture 0 the clay in use. a I

and similar materials liquid sodium silicate and Application fled August 26, 1921. Serial Io. 495,548.

txamin The present invention consists in mixing in suitable proportions uartzite or silica fock, silicabrick bats or caicmed silica li ighy refractory and plastic fire cla and sodium ulverized iorm. The quartzite, silica, hue and fire clay are oundtogather in suitable machinery, suc wring roll and passed through a screen to secure a fineness approximately 100% through 40 mesh screen. The dr sodiumsilicate is purchased in the marl; et in the form of a powder, and is mixed in with the other ingredients, from five to twenty percent being used. The ingredients are carefully weighed and mixed in some such machine as a concrete mixer, in order to insure accuracy of mix and uniformity throughout. This dry mixture is then put in airtight containers, such as cans, barrels or paper bags suitably treated with some protecting medium such as parafiine, tar or the like. Sacks are much preferred on account of the ease in handling and the fact that they do not need to be returned by the consumer. It is necessary that the containers be practically air-tight, because, the material tends to deteriorate when expose to. the air.

When a suitable amount of water is added to this dry mixture, the mortar which will be formed may be used in laying refractory brick, or as a daubing or coating mixture applied, to the surface of the refractory brick work. When carefully mixedthe material will to 'set in a few hours, and when dried out is very hard, making solid walls.

The cement has great strength after drying,

and especially affter'heat is applied. In man cases this strength is greater than the bric itself, and u n breaking, the brick will break through before the cement joint, and it retains its full strength up to a heat ap roximating its melting point.

rdinarily when laying fire brick or silica brick, ground fire clay or quartzite and fire clay are used. But with this material alone the mortar has very little bond or strength until after it'has been heated up to a very high temperature, say 250Q Fahrenhe t. The fact that such joinf 'iii'eweak 'inakes them porous and allows gases and molten metals to uetrate the joints and thus to attack the rick work. The special refracto cement or cement herein referred to I claim: ma es a vastly superior bond, resulting in a A dry powdered refractory cement comhard, dense joint. position consistin of silica, fire clay, cal- 10 The chemical composition of the mixture cined silica, and 0m 5 vto 20% of sodium 5 herein disclosed is acid, but it can be used silicate. v

to advantage in almost all furnaces where In testimon whereof, I sign my name. fire clay or silica brick are used. VILLIAM F. ROCHOW. 

